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'2 Sheets-Sheet i. M. C. GRITZNER. Sewing Machine for WorkingButtonhoi'es.

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Lam Patent No. 76,323, dated April 7, 1868.

IMPROVEMENT IN SEWING-MACHINE FOR WORKING BUTTON-HOLES.

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To WHOM IT MAY concnnm Be it known that I, M. C; GRITZNER, a citizen ofthe United States, temporarily residing at Bruchsal, 'in

.the Grand Duchy of Bad en, have invented'certain new and usefulImprovements in Mechanism for Making Button-Holes and zigzag ornaments,sewing around edges, 360., said mechanismbeing applicable to varioussystems of one and two-thread sewing-machines without changing theircharacter; as ordinary sowing-machines, for which I applied for apatentin the Empire of France-in the month of September, 1867, and which Idesire to secure by LettersPatent in the United States of America; and Ihereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawings,

The object I have in view in this invention is toproducc a mechanismpossessing the character of an accessory to a sewing-machine, andapplicable to variou's systems of sewing-machines, either as a permanentfixture or as ameohanism capable of being removed in an easy and simplemanner by any person of common experience in the use of sewing-machines,said mechanism serving to make button-holes, zigzag ornaments, and

similar work, or to sew around edges. The manner in which my object isrealized can best be explained by reference to the accompanying sheetsof drawings, in which- Figure 1 represents a side elevation of a machineto which my improvements are applied, the cloth-plate and cloth-movingmechanism being represented in section.

Figure 2 represents a top and a side view of the feed-piece.

Figure 3 is a top view of the accessory mechanism detached.

Figure 4 is a side elevation of the same-in an inverted position..

Figure 5 represents the sliding or reciprocating plate ofthe mechanismreferred to.

Figure 6 is a sectionof the same on the line A B C- D, fig. 5.

Figure 7 is a view of the bottom or under plate of the mechanism.

Figure 8 is a perspective view of so much of a sewing-machine-as isneeded to illustrate my invention, the

-box on the side being partly brok en away to exhibit the arrangement ofthe gearing.

The mechanism above referred to is represented as applied to asewing-machine, fig. 1, of the one-thread system, working with a needleand a hook, n. The cloth-moving mechanism is placed on the cloth-plateof the sewing-machine and is attached to it by means of a screw-nut, V.It consists of three plates, d b 0, one of which, 1), slides between theother two. Within this plate is placed a feed-piece, C D, in such mannerthat, while it follows the lateral motions of the plate b, it is atliberty to move forward or backward, as well as upward and downward, aswill be presently'explained. The object of this feed-piece is to impartto the cloth the necessary forward motion for making stitches of acertain length, and at the same time to aid the lateral motion ofthecloth imparted to the latter by the tongue hereinafter described. Onthe shaft F of the machine (which is combined with the rest of themachine so as to cause the needle to complete one ascent and one descentduring one revolution of the shaft l'there 1s a gear-wheel, B, whichtakes into a second gear-wheel, A,

I to which latter there is attached a grooved cam, E. The diameter andnumber of cogs of the gear A are exactly double those of the pinion B inorder that the shaft F shall make two revolutions to one of the wheel A.Figure 7 bis represents the surface of the cam when stretched out in aplane. The lateral motion of the plate 6 is obtained by means of afrietion-roller,G, pivoted to said plate and taking into the groove ofthe-cam E. The feed-piece G D has a small projection, (i, on its underside that enters a slot cut in the regular feed-dog of the machine, andthe regular movement of the feed-dog imparts in this way'motion to thefeed-piece C D. By this means the length of stitch can be regulated atwilland in the ordinary manner. The central portion of the plate 6terminates in a tongue, a, of slender shape, which moves alternately tothe right and left of the needle, and aids in imparting-to the cloth thenecessary lateral vibratory motion for the production of the zigzagbutton-hole stitch. The stitches are formed around said tongue and sliptherefrom as the cloth gradually advances. This is an entirely originalfeature of my invention, and serves principally two purposes, besidesaiding the lateral motion, as described: First, it serves to produce avery great regularity in the lateral dimension of the zigzag stitching;and; secondly, this tongue, in combination with the two prongs m m,- oneof which lies on each side of the tongue, as shown in fig. 7, ser. cs tosupport the cloth, and to prevent it from being dragged down by theaction of the needle while penetrating the cloth. The neodlc of course,stitehesaltcrnately in the two slots 1 formed between the tongue and thesaid two prongs m m.

The plate 0 is made thicker around the hole P, through which the needleoperates; and this thicker surface is made to incline forward, asrepresented in fig. 6.' The incline thus formed ssrvesto throw Forwardeach loop (while being dragged to the right or left) sufficiently toprevent the needle-from becoming entangled with the loop alreadycompleted. By this simple means it is practicable to produce stitchingso close that the threads actually touch each other without danger ofbreaking the thread. The hole in the'platc 0' serves for introducing athread, cord, or tape into the under seam, such as is required along theedge of the fabric to strengthen the button-hole. 'A cord can also beintroduced into theupper seam by simply placing it alongside the needle.Both operations are performed automatically. A sponge, r, is attached-bya pin, a, to the under surface of the plate of the sewing-machine, asshownin figs. 1 and 8, in such manner as to project into the camgroove,and (the sponge being well saturated with oil) keep the groovelubricated for a much longer period than by lubricating it in theordinary manner. i

Having now described my invention, and the manner in which the same isormay be carried into ell'ect, what I claim, and desire to secure byLetters Patent, is-

1. The combination, with the needle of a sewing-machine, of ordinary orsuitableconstruction, of a laterally reciprocating tongue-plate,substantially as specified, and mechanism for imparting said movement tothe tongue under the arrangement described, so that the said tongue willbe placed close to and alternately to the right and left of the needle.during each two successive stitches the needle makes, and so impart azigzag motion to the cloth to be. sewed, substantially as shown andspecified.

2. The laterally reciprocating plate, having two slots, one on each sideof the tongue, through which the needle alternately stitches, the metalaround said slots serving as a firm support to the cloth, and preventingthe latter from being dragged down when penetrated by the needle.

3. The mechanism herein described for moving the material forbutton-hole sewing, &c., combined with gearing and a cam, or itsequivalent, substantially as specified, applied to a sewing-machine insuch manner that the said mechanism, when engaged with said gearing andcam, will more laterally in one direction while the needle makes onestitch, and in the opposite direction during the next succeeding stitch,as shown and set forth. 4. The combination of the laterallyreciprocating tongue or plate with a feed-piece adapted to engage withthe ordinary feed-dog of a sewing-machine, and so arranged that the saidfeed-piece, while moving laterally with the reciprocating tongue, shallhave an independent forward and backward and up-an'ddown movement forthe purpose of effecting the feed of the cloth, as set forth.

5. The combination and arrangement of the plates at I) and the plate a,with its appurtenances, the whole 7 constituting a device or mechanismfor button-hole sewing, at, capable of being applied either temporarilyor permanently to any suitable sewing-machine, in the manner hereinshown and described.

M. O. GRITZNER. [L. s.]

Witnesses:

F. Garrznnn, O. NIPTAL.

